I just wanted to share with you an example of how helpful it is to get advice here.
FI and I finished addressing invitations last night (woo!).
When we built our guest list, we accounted for everyone single to have a plus-one. A lot can change in a year and a half of planning.
a) At a family party this past weekend, I asked his second cousin if she had someone special in her life and she say, "Oh, no, I'm just coming with my parents!" When addressing invites, FI asked me why I was still giving her a plus-one when she specifically said she didn't need one. I said, "Well she might meet the love of her life tomorrow. The wedding's still two months away."
b) FI gave one of his friends a plus-one because the guy will know too few people at the wedding. In addressing a groomsman's invite, he said don't bother adding a plus-one because the guy won't bring one. I gave the same answer as above.
c) A good friend of mine is single and may bring someone he's dating or just bring his best friend (a person I really like but didn't make the guest list because we're keeping things rather small). FI asked why he got a plus one because "I don't want to pay $xxx for someone to bring a random date!" I said, "Friend actually doesn't know too many people at the wedding and if he IS dating someone by the wedding, he deserves to bring them."
The funny thing is, before I got engaged, I had imagined that I, too, wouldn't want to pay a ton of money to host people we'd never see again. Luckily we have the budget for it, but more importantly, I realized I didn't care. Having people I DO care about feel comfortable at our event is more important. I think FI saw the light.
ETA: The Knot hates my work computer and eliminates paragraphs.
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